Re: SATA150TX4 atat1:command timeout

[Francois Payette <francoisp@netmosphere.net>]

It seems that the locking problem we were experiencing was related to 
the disparities of drives in a raid 0 array; when we replaced the 
6Y200M0 with another 6B200S0 the problem never reappeared even after 1.8 
TB of io. Thanks a buch to Eric for pointing out the differences; the 
promise card and/or driver must have a problem with the bridge chip on 
that drive when interfacing with another drive that does not have that 
chip. We also tested for performance improvements with

writel(tmp, mmio + PDC_TBG_MODE);

commented out from pdc_host_init, but it does not cause a significant 
difference when benchmarked with bonnie++.

Thanks for your help,
Francois